#include <stdio.h>

int main() {
   /* 局部变量声明 */
   int a, b;
   int c;

   /* 实际初始化 */
   a = 10;
   b = 20;
   c = a + b;

   printf("value of a = %d, b = %d and  c = %d\n", a, b, c);
   
   return 0;
}